US20250295887A1 - Catheter - Google Patents

Catheter

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Publication number
US20250295887A1
US20250295887A1 US19/227,617 US202519227617A US2025295887A1 US 20250295887 A1 US20250295887 A1 US 20250295887A1 US 202519227617 A US202519227617 A US 202519227617A US 2025295887 A1 US2025295887 A1 US 2025295887A1
Authority
US
United States
Prior art keywords
end side
distal end
rear end
marker
catheter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
US19/227,617
Other languages
English (en)
Inventor
Saisamphan WIJAIRAK
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Asahi Intecc Co Ltd
Original Assignee
Asahi Intecc Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asahi Intecc Co Ltd filed Critical Asahi Intecc Co Ltd
Assigned to ASAHI INTECC CO., LTD. reassignment ASAHI INTECC CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WIJAIRAK, SAISAMPHAN
Publication of US20250295887A1 publication Critical patent/US20250295887A1/en
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
    • A61M25/0023—Catheters; Hollow probes characterised by the form of the tubing by the form of the lumen, e.g. cross-section, variable diameter
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/0043—Catheters; Hollow probes characterised by structural features
    • A61M25/005—Catheters; Hollow probes characterised by structural features with embedded materials for reinforcement, e.g. wires, coils, braids
    • A61M25/0053—Catheters; Hollow probes characterised by structural features with embedded materials for reinforcement, e.g. wires, coils, braids having a variable stiffness along the longitudinal axis, e.g. by varying the pitch of the coil or braid
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/0043—Catheters; Hollow probes characterised by structural features
    • A61M25/0054—Catheters; Hollow probes characterised by structural features with regions for increasing flexibility
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/0067—Catheters; Hollow probes characterised by the distal end, e.g. tips
    • A61M25/0068—Static characteristics of the catheter tip, e.g. shape, atraumatic tip, curved tip or tip structure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/0067—Catheters; Hollow probes characterised by the distal end, e.g. tips
    • A61M25/0068—Static characteristics of the catheter tip, e.g. shape, atraumatic tip, curved tip or tip structure
    • A61M25/0069—Tip not integral with tube
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/0105—Steering means as part of the catheter or advancing means; Markers for positioning
    • A61M25/0108—Steering means as part of the catheter or advancing means; Markers for positioning using radio-opaque or ultrasound markers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/0067—Catheters; Hollow probes characterised by the distal end, e.g. tips
    • A61M25/008—Strength or flexibility characteristics of the catheter tip
    • A61M2025/0081—Soft tip
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M2025/0183—Rapid exchange or monorail catheters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/32—General characteristics of the apparatus with radio-opaque indicia

Definitions

  • the present disclosure relates to a catheter.
  • Patent Literature 1 describes a catheter including two markers at a distal end portion, which can be visually recognized by an operator under X-ray fluoroscopy.
  • the distal end portion of the catheter is required to have flexibility for facilitating advancement in a blood vessel.
  • One or more embodiments are directed to improving the flexibility of a distal end portion of a catheter.
  • the present disclosure has been made to solve at least a part of the issue described above and can be implemented as the following aspects.
  • a catheter includes a hollow shaft, a distal end side marker at a distal end portion of the shaft, a rear end side marker at the distal end portion of the shaft closer to a rear end side than the distal end side marker, a distal end side tube covering an outer periphery of the distal end side marker, and a rear end side tube covering an outer periphery of the rear end side marker, and a rear end of the distal end side tube and a distal end of the rear end side tube are separated from each other.
  • FIG. 2 is an explanatory view illustrating a longitudinal section of a distal end portion of the catheter.
  • FIG. 3 is an explanatory view illustrating a longitudinal section in the vicinity of a marker.
  • FIG. 4 is an explanatory view illustrating a transverse section of the catheter.
  • FIG. 5 is an explanatory view illustrating a longitudinal section in the vicinity of a marker of a catheter according to a second embodiment.
  • FIG. 6 is an explanatory view illustrating a longitudinal section in the vicinity of a marker of a catheter according to a third embodiment.
  • FIG. 7 is an explanatory view illustrating a longitudinal section in the vicinity of a marker of a catheter according to a fourth embodiment.
  • FIG. 8 is an explanatory view illustrating a longitudinal section in the vicinity of a marker of a catheter according to a fifth embodiment.
  • FIG. 1 is an explanatory view illustrating the overall configuration of a catheter 1 according to a first embodiment.
  • FIG. 2 is an explanatory view illustrating a longitudinal section of a distal end portion of the catheter 1 .
  • an end portion located on the distal end side of each constituent member of the catheter 1 will be referred to as a “distal end”, and a portion that includes the “distal end” and extends halfway from the distal end toward the rear end side will be referred to as a “distal end portion”.
  • each constituent member an end portion located on the rear end side of each constituent member is referred to as a “rear end”, and a portion that includes the “rear end” and extends halfway from the rear end toward the distal end side is referred to as a “rear end portion”.
  • the catheter 1 is a medical device that is inserted into a blood vessel, a digestive organ, or the like, and is used for treatment, diagnosis, or the like, of a human body.
  • the catheter 1 includes a shaft 15 ( FIG. 2 ), an intermediate tube 20 , a distal end side tube 70 , a rear end side tube 90 , a distal end side marker 30 , a rear end side marker 50 , a distal tip 110 , and a connector 120 ( FIG. 1 ).
  • the shaft 15 is a hollow member extending in the longitudinal direction of the catheter 1 .
  • the shaft 15 includes a straight portion 16 and a tapered portion 17 .
  • the straight portion 16 is a portion of the shaft 15 having a substantially constant outer diameter in the longitudinal direction of the shaft 15 .
  • “substantially” is to indicate within manufacturing tolerances and is used to indicate approximation, not as a relative term, and may be applicable to any descriptive parameter, e.g., straight, equal, and so forth, whether or not the term is used in connection with the descriptive parameter.
  • the tapered portion 17 is a portion of the shaft 15 in which the outer diameter increases from the distal end side toward the rear end side of the shaft 15 .
  • the outer diameter of a rear end 17 b of the tapered portion 17 is larger than the outer diameter of a distal end 17 a of the tapered portion 17 .
  • the straight portion 16 is provided on the distal end side of the shaft 15
  • the tapered portion 17 is provided closer to the rear end side than the straight portion 16 .
  • a lumen 18 is formed inside the shaft 15 .
  • the lumen 18 is a space that is surrounded by the inner periphery of the shaft 15 and extends in the longitudinal direction of the shaft 15 .
  • a guide wire, a delivery device for delivering an embolic substance used for treatment of an aneurysm, or the like, can be passed through the lumen 18 .
  • the intermediate tube 20 is a hollow member covering the outer periphery of the shaft 15 .
  • a braid 21 is provided inside the intermediate tube 20 along the longitudinal direction of the catheter 1 .
  • the braid 21 is formed by braiding four wires 22 .
  • the distal end side tube 70 is a hollow member covering a part of the outer periphery of the intermediate tube 20 and a part of the outer periphery of the distal end side marker 30 .
  • the distal end side tube 70 is provided on the outer periphery of the straight portion 16 of the shaft 15 .
  • the rear end side tube 90 is a hollow member covering a part of the outer periphery of the intermediate tube 20 and the outer periphery of the rear end side marker 50 .
  • the rear end side tube 90 is provided closer to the rear end side than the distal end side tube 70 in the longitudinal direction of the shaft 15 .
  • the rear end side tube 90 includes a first rear end side tube 92 and a second rear end side tube 93 .
  • the first rear end side tube 92 covers the outer periphery of the distal end side of the tapered portion 17 of the shaft 15 .
  • the second rear end side tube 93 covers the outer periphery of the rear end side of the tapered portion 17 of the shaft 15 .
  • a boundary between the first rear end side tube 92 and the second rear end side tube 93 is referred to as a “boundary B 0 ”.
  • the mean value of the bending rigidity of the rear end side tube 90 at each position of the rear end side tube 90 obtained by equally dividing the portion between the distal end 17 a and the intermediate position of the tapered portion 17 into four portions at equal intervals.
  • the mean value of the bending rigidity of the rear end side tube 90 at each position of the rear end side tube 90 obtained by equally dividing the portion between the intermediate position and the rear end 17 b of the tapered portion 17 into four portions at equal intervals.
  • the difference in the bending rigidity between the first rear end side tube 92 and the second rear end side tube 93 can be set, for example, by forming the two tubes from materials having different hardnesses or by changing the thicknesses of the two tubes.
  • the respective materials of the shaft 15 , the intermediate tube 20 , the distal end side tube 70 , and the rear end side tube 90 are not particularly limited, and it is possible to use, for example, nylon resin such as polyamide, polyethylene, polypropylene, polyolefin such as ethylene-propylene copolymers, polyester such as polyethylene terephthalate, polyvinyl chloride, ethylene-vinyl acetate copolymers, crosslinked ethylene-vinyl acetate copolymer, thermoplastic resin such as polyurethane, fluororesin such as polytetrafluoroethylene (PTFE), polyamide elastomer, polyolefin elastomer, polyurethane elastomer, silicone rubber, latex rubber, etc.
  • nylon resin such as polyamide, polyethylene, polypropylene, polyolefin such as ethylene-propylene copolymers, polyester such as polyethylene terephthalate, polyvinyl chloride, ethylene-vinyl a
  • the distal end side marker 30 is an annular member made of a material having a low X-ray transmittance.
  • the distal end side marker 30 is provided at the distal end portion of the shaft 15 .
  • the distal end side marker 30 is provided on the outer periphery of the straight portion 16 of the shaft 15 .
  • the phrase “the distal end side marker 30 is provided at the distal end portion of the shaft 15 ” means that at least a part of the distal end side marker 30 is at the same position in the axial direction as the distal end portion of the shaft 15 , and the distal end side marker 30 does not necessarily need to be directly connected to the distal end portion of the shaft 15 .
  • the distal end side marker 30 is indirectly fixed to the distal end portion of the shaft 15 via the intermediate tube 20 .
  • the outer periphery of the distal end portion of the distal end side marker 30 is covered with the distal tip 110
  • the outer periphery of the rear end portion of the distal end side marker 30 is covered with the distal end side tube 70 .
  • the rear end side marker 50 is an annular member made of a material having a low X-ray transmittance.
  • the rear end side marker 50 is provided at the distal end portion of the shaft 15 .
  • the rear end side marker 50 is provided on the outer periphery of the straight portion 16 of the shaft 15 .
  • the phrase “the rear end side marker 50 is provided at the distal end portion of the shaft 15 ” means that at least a part of the rear end side marker 50 is at the same position in the axial direction as the distal end portion of the shaft 15 , and the rear end side marker 50 does not necessarily need to be directly connected to the distal end portion of the shaft 15 .
  • the rear end side marker 50 is indirectly fixed to the distal end portion of the shaft 15 via the intermediate tube 20 .
  • the rear end side marker 50 is closer to the rear end side than the distal end side marker 30 .
  • the outer periphery of the rear end side marker 50 is covered with the rear end side tube 90 .
  • the shapes of the distal end side marker 30 and the rear end side marker 50 are not limited to an annular shape and may be, for example, a plate shape covering only a part of the outer periphery of the intermediate tube 20 , or a coil shape as described below in a third embodiment.
  • the material of the distal end side marker 30 and the material of the rear end side marker 50 are not particularly limited, and it is possible to use, for example, gold, platinum, tungsten, or an alloy containing these elements (for example, a platinum-nickel alloy).
  • the material of the distal tip 110 is not particularly limited, and it is possible to use, for example, a resin material such as polyurethane, polyurethane elastomer, polyamide, or polyamide elastomer.
  • the connector 120 is a member that connects the catheter 1 , which is connected to the rear end portion of the rear end side tube 90 , to another medical device such as a syringe.
  • FIG. 3 is an explanatory view illustrating a longitudinal section of the vicinity of the markers ( 30 , 50 ) in the catheter 1 .
  • the distal end side tube 70 covers a part of the outer periphery of the distal end side marker 30 .
  • a rear end 71 of the distal end side tube 70 is closer to the rear end side than a rear end 31 of the distal end side marker 30 .
  • the rear end side tube 90 covers the outer periphery of the rear end side marker 50 .
  • a distal end 91 of the rear end side tube 90 is closer to the distal end side than a distal end 51 of the rear end side marker 50 .
  • the outer periphery of the rear end side marker 50 is not exposed to the outside.
  • the rear end 71 of the distal end side tube 70 and the distal end 91 of the rear end side tube 90 are provided to be separated from each other.
  • the section between the rear end 71 of the distal end side tube 70 and the distal end 91 of the rear end side tube 90 is referred to as a “section S 0 ”.
  • the space between the rear end 71 of the distal end side tube 70 and the distal end 91 of the rear end side tube 90 which is provided at the section S 0 , is referred to as a “gap 80 ”.
  • the gap 80 is formed along the outer periphery of the intermediate tube 20 .
  • section S 1 the section from the distal end of the distal end side marker 30 to the rear end 71 of the distal end side tube 70 is referred to as a “section S 1 ”.
  • section S 2 the section from the rear end of the rear end side marker 50 to the distal end 91 of the rear end side tube 90 is referred to as a “section S 2 ”.
  • FIG. 4 is an explanatory view illustrating a transverse section of the catheter 1 .
  • (A) to (E) of FIG. 4 illustrate the A-A cross-section, the B-B cross-section, the C-C cross-section, the D-D cross-section, and the E-E cross-section of FIG. 2 , respectively. Each figure will be described below.
  • the catheter 1 in the section S 1 includes the shaft 15 , the intermediate tube 20 , the distal end side tube 70 , and the distal end side marker 30 .
  • the catheter 1 in the section S 2 includes the shaft 15 , the intermediate tube 20 , the rear end side tube 90 , and the rear end side marker 50 .
  • the distal end side tube 70 , the rear end side tube 90 , the distal end side marker 30 , and the rear end side marker 50 are not provided. Accordingly, the bending rigidity of the catheter 1 in the section S 0 is smaller than the bending rigidity of the catheter 1 in the section S 1 and the bending rigidity of the catheter 1 in the section S 2 .
  • the flexibility of the portion of the catheter 1 between the distal end side tube 70 and the rear end side tube 90 is high.
  • the tubes ( 70 , 90 ) and the markers ( 30 , 50 ) are not provided at the section S 0 , the outer diameter of the catheter 1 in the section S 0 is smaller than the outer diameter of the catheter 1 in the section S 1 or the outer diameter of the catheter 1 in the section S 2 .
  • the braid 21 may be formed by a combination of two wires 22 wound in a first direction and two wires 22 wound in a second direction different from the first direction along the longitudinal direction of the intermediate tube 20 .
  • the material of the wire 22 is not particularly limited, and for example, tungsten can be used.
  • the rear end 71 of the distal end side tube 70 and the distal end 91 of the rear end side tube 90 are separated from each other. Since the outer layer tubes ( 70 , 90 ) and the markers ( 30 , 50 ) are not provided at the section S 0 , the bending rigidity of the catheter 1 in the section S 0 is smaller than the bending rigidity of the catheter 1 in the sections (S 1 , S 2 ) adjacent to the section S 0 . In addition, the outer diameter of the catheter 1 in the section S 0 is smaller than the outer diameter of the catheter 1 in the sections (S 1 , S 2 ). Thus, the flexibility of the distal end portion of the catheter 1 can be improved. Since the section S 0 is between the distal end side marker 30 and the rear end side marker 50 , it is possible to improve the flexibility between the distal end side marker 30 and the rear end side marker 50 in the catheter 1 .
  • the catheter 1 can be used for treatment of an aneurysm.
  • the distal end side marker 30 and the rear end side marker 50 function to indicate the position of the distal end portion of the catheter 1 under X-ray fluoroscopy and can be used for positioning of a delivery device for delivering an embolic substance used for treatment of an aneurysm.
  • the portion of the catheter 1 included in the section S is advanced toward the end of the blood vessel along the guide wire inserted into the blood vessel in advance.
  • the resistance received from the curved blood vessel, or the like makes it difficult for the catheter 1 to follow the guide wire and advance in the blood vessel; however, since the portion of the catheter 1 included in the section S is flexible, the catheter 1 can easily follow the guide wire.
  • the distal end side marker 30 and the rear end side marker 50 are provided at the straight portion 16 of the shaft 15 .
  • the markers ( 30 , 50 ) are provided at the straight portion 16 provided on the distal end side of the catheter 1 .
  • the bending rigidity of the first rear end side tube 92 is smaller than the bending rigidity of the second rear end side tube 93 .
  • the portion (the boundary B 0 ) where the bending rigidity of the rear end side tube 90 changes is between the distal end 17 a and the rear end 17 b of the tapered portion 17 .
  • a change in the bending rigidity of the catheter 1 in the straight portion 16 can be suppressed, and the straight portion 16 can easily follow the guide wire inserted into the body in advance.
  • FIG. 7 is an explanatory view illustrating a longitudinal section of the vicinity of the markers ( 30 , 50 ) of a catheter 1 D according to a fourth embodiment.
  • the catheter 1 D is different from the catheter 1 according to the first embodiment in that a distal end side tube 70 D extends to the distal end side beyond the distal end of the shaft 15 .
  • the description for the configuration of the catheter 1 D common to the configuration of the catheter 1 will be omitted.
  • FIG. 8 is an explanatory view illustrating a longitudinal section of the vicinity of the markers ( 30 , 50 ) of a catheter 1 E according to a fifth embodiment.
  • the catheter 1 E is different from the catheter 1 according to the first embodiment in that the shapes of a rear end 71 E of a distal end side tube 70 E and a distal end 91 E of a rear end side tube 90 E (a first rear end side tube 92 E) are a tapered shape.
  • the description for the configuration of the catheter 1 E common to the configuration of the catheter 1 will be omitted.
  • the thickness of the distal end side tube 70 E is referred to as a “thickness t 1 ”, and the thickness of the rear end side tube 90 E is referred to as a “thickness t 2 ”.
  • the rear end 71 E of the distal end side tube 70 E has a tapered shape in which the thickness t 1 gradually decreases from the distal end side toward the rear end side of the catheter 1 E.
  • the distal end 91 E of the rear end side tube 90 E has a tapered shape in which the thickness t 2 gradually decreases from the rear end side toward the distal end side of the catheter 1 E.
  • a part of the outer peripheral surface of the rear end 71 E of the distal end side tube 70 E and the distal end 91 E of the rear end side tube 90 E is formed by a curved surface. Accordingly, the bending rigidity in the longitudinal direction of the catheter 1 E can gently change in the vicinity of the rear end 71 E of the distal end side tube 70 E and in the vicinity of the distal end 91 E of the rear end side tube 90 E.
  • the catheter 1 E can also improve the flexibility of the distal end portion of the catheter 1 E.
  • the distal end side markers ( 30 , 30 B, 30 C) and the rear end side markers ( 50 , 50 B, 50 C) are provided at the straight portion 16 of the shaft 15 .
  • the distal end side markers ( 30 , 30 B, 30 C) and the rear end side markers ( 50 , 50 B, 50 C) may be provided at the tapered portion 17 of the shaft 15 .
  • the catheters ( 1 , 1 B, 1 C, 1 D, 1 E) according to the first embodiment to the fifth embodiment are configured by overlapping the shaft 15 , the intermediate tube 20 , the distal end side tube ( 70 , 70 D, 70 E), and the rear end side tube ( 90 , 90 E).
  • the catheters ( 1 , 1 B, 1 C, 1 D, 1 E) do not need to include the shaft 15 and do not need to include the intermediate tube 20 .
  • the catheters ( 1 , 1 B, 1 C, 1 D, 1 E) may be configured by the distal end side tube ( 70 , 70 D, 70 E) that covers the outer periphery of the distal end side marker ( 30 , 30 B, 30 C) and the rear end side tube ( 90 , 90 E) that covers the outer periphery of the rear end side marker ( 50 , 50 B, 50 C).
  • the rear end ( 71 , 71 E) of the distal end side tube ( 70 , 70 D, 70 E) is closer to the rear end side than the rear end 31 of the distal end side marker ( 30 , 30 B, 30 C), and the distal end ( 91 , 91 E) of the rear end side tube ( 90 , 90 E) is closer to the distal end side than the distal end 51 of the rear end side marker ( 50 , 50 B, 50 C).
  • the rear end ( 71 , 71 E) of the distal end side tube ( 70 , 70 D, 70 E) may be closer to the distal end side than the rear end 31 of the distal end side marker ( 30 , 30 B, 30 C), and the distal end ( 91 , 91 E) of the rear end side tube ( 90 , 90 E) may be closer to the rear end side than the distal end 51 of the rear end side marker ( 50 , 50 B, 50 C).
  • a catheter includes a hollow shaft, a distal end side marker that is provided at a distal end portion of the shaft, a rear end side marker that is provided at the distal end portion of the shaft and is closer to a rear end side than the distal end side marker, a distal end side tube covering an outer periphery of the distal end side marker, and a rear end side tube covering an outer periphery of the rear end side marker, and a rear end of the distal end side tube and a distal end of the rear end side tube are provided to be separated from each other.
  • the shaft may include a straight portion having a substantially constant outer diameter in an axial direction of the shaft, and a tapered portion that is provided closer to a rear end side than the straight portion and has a larger outer diameter at a rear end than an outer diameter at a distal end, and the distal end side marker and the rear end side marker may be provided at the straight portion.
  • the rear end side tube may cover an outer periphery of the tapered portion, and a bending rigidity of a portion of the rear end side tube that covers a distal end side of the tapered portion may be smaller than a bending rigidity of a portion of the rear end side tube that covers a rear end side of the tapered portion.
  • the catheter according to the above-described aspect may further include a distal tip that is closer to a distal end side than the distal end side marker and is adjacent to the distal end side marker.
  • a part of the shaft may be provided between the rear end of the distal end side tube and the distal end of the rear end side tube.
  • the rear end of the distal end side tube may be closer to a rear end side than a rear end of the distal end side marker, and the distal end of the rear end side tube may be closer to a distal end side than a distal end of the rear end side marker.
  • the distal end side tube covers the rear end of the distal end side marker, and the rear end side tube covers the distal end of the rear end side marker, so that it is possible to reduce the possibility that the markers are exposed.
  • the present invention can be implemented in various aspects and can be implemented in the form of, for example, a guide wire, a method for manufacturing a guide wire, a catheter, a method for manufacturing a catheter, an endoscope, or a dilator.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biophysics (AREA)
  • Pulmonology (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Media Introduction/Drainage Providing Device (AREA)
US19/227,617 2022-12-13 2025-06-04 Catheter Pending US20250295887A1 (en)

Applications Claiming Priority (3)

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JP2022198605A JP2024084369A (ja) 2022-12-13 2022-12-13 カテーテル
JP2022-198605 2022-12-13
PCT/JP2023/032854 WO2024127750A1 (ja) 2022-12-13 2023-09-08 カテーテル

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JP (1) JP2024084369A (enExample)
WO (1) WO2024127750A1 (enExample)

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* Cited by examiner, † Cited by third party
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